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Stock-Based Compensation Plan (Summary Of Stock Option Activities) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding at beginning of period, Number of Shares 850,167 859,560 1,428,255
Options granted, Number of Shares 0 0 230,500
Options exercised, Number of Shares (185,221) (9,393) (799,195)
Options forfeited, Number of Shares (3,000)    
Options expired, Number of Shares (15,000)    
Options outstanding at end of period, Number of Shares 646,946 850,167 859,560
Options exercisable, Number of Shares 568,876    
Expected to vest after end of period, Number of Shares 78,070    
Options outstanding at beginning of period, Weighted Average Exercise Price $ 16.46 $ 16.44 $ 16.31
Options granted, Weighted Average Exercise Price     16.80
Options exercised, Weighted Average Exercise Price 14.06 14.76 16.31
Options forfeited, Weighted Average Exercise Price 12.88    
Options expired, Weighted Average Exercise Price 25.53    
Options outstanding at end of period, Weighted Average Exercise Price 16.96 $ 16.46 $ 16.44
Options exercisable, Weighted Average Exercise Price 17.44    
Expected to vest after end of period, Weighted Average Exercise Price $ 13.44    
Weighted average remaining term 5 years 7 months 6 days    
Weighted average remaining term 5 years 4 months 24 days    
Expected to vest after end of period, Weighted Average Remaining Contractual Term (in years) 6 years 10 months 24 days    
Aggregate intrinsic value of options outstanding $ 7,779    
Options exercisable at end of period, Aggregate Intrinsic Value (in thousands) 6,566    
Expected to vest after end of period, Aggregate Intrinsic Value (in thousands) $ 1,213